emotion vs sentiment

emotion

noun
  • A person's internal state of being and involuntary physiological response to an object or a situation, based on or tied to physical state and sensory data. 

  • A reaction by a non-human organism with behavioral and physiological elements similar to a person's response. 

sentiment

noun
  • Feelings, especially tender feelings, as apart from reason or judgment, or of a weak or foolish kind. 

  • A general thought, feeling, or sense. 

How often have the words emotion and sentiment occurred in a corpus of books? (source: Google Ngram Viewer )